The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform
Paul R Haddad - One of the best experts on this subject based on the ideXlab platform.
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Ion Chromatography.
Analytical and bioanalytical chemistry, 2004Co-Authors: Paul R HaddadAbstract:In its initial guise, the technique of Ion Chromatography\ud (IC) was considered to encompass the separatIon and quantificatIon\ud of low molecular weight Ions [1, 2, 3, 4] by highperformance\ud Ion-exchange Chromatography. In the early\ud days, the analytes separated by IC were typically inorganic\ud anIons and catIons, but nowadays IC is used for the separatIon\ud of a much wider range of species, such as organic\ud acids and bases, amino acids, carbohydrates, etc. Despite\ud this, most chemists still see IC as a method primarily for the\ud determinatIon of inorganic anIons and it is for this analysis\ud that IC is used most frequently. Common applicatIon areas\ud include environmental analysis, clinical analysis, and industrial\ud analysis, just to mentIon a few
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Electrostatic Ion Chromatography
TrAC Trends in Analytical Chemistry, 1998Co-Authors: Paul R HaddadAbstract:Electrostatic Ion Chromatography (EIC) is a unique analytical method which separates Ions on a bi-functIonal zwitterIonic statIonary phase using pure water as the mobile phase. An introductIon to this Ion chromatographic method is given and new areas for the further development of the technique are discussed
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Advances in detectIon techniques for Ion Chromatography
Journal of Chromatography A, 1997Co-Authors: Wolfgang W Buchberger, Paul R HaddadAbstract:The advances in detectIon techniques for Ion Chromatography that have been achieved within the last five years are reviewed, with special attentIon to conductivity, amperometric and potentiometric detectIon, post-column reactIon detectIon including UV–Vis absorbance, fluorescence and luminescence measurements, atomic spectroscopic detectIon and combinatIon with mass spectrometry. Typical applicatIons for each detectIon mode are summarized
Corrado Sarzanini - One of the best experts on this subject based on the ideXlab platform.
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DeterminatIon of epichlorohydrin by sulfite derivatizatIon and Ion Chromatography: characterizatIon of the sulfite derivatives by Ion Chromatography-mass spectrometry.
Journal of chromatography. A, 2004Co-Authors: Maria Concetta Bruzzoniti, Samo Andrensek, Milko Novic, Daniela Perrachon, Corrado SarzaniniAbstract:This work is an upgrade of a previously developed method (J. Chromatogr. A 884 (2000) 251] for epichlorohydrin determinatIon by Ion Chromatography (IC) and conductivity detectIon. Here, an Ion Chromatography-mass spectrometry (IC-MS) coupling has been employed for the separatIon and the identificatIon of products of epichlorohydrin when reacted with the nucleophilic agent SO3(2-). The high capacity column (IonPac AS11-HC) used for separatIon provided good resolutIon. This allowed evaluatIon of the IC behavior and mass spectrometric identificatIon of epichlorohydrin sulfite derivatives. By using atmospheric pressure interfaces (ESI and APCI) the following species were tentatively identified: 2,3-dihydroxy-1-propanesulfonic, 2,3-epoxy-1-propanesulfonic,1,3-dihydroxy-2-propanesulfonic and 3-oxetanesulfonic acids and 2-hydroxy-1,3-propanedisulfonic acid (or its isomer 3-hydroxy-1,2-propanedisulfonic acid). The study showed that chlorine atoms are displaced from epichlorohydrin during the reactIon, while mass spectrometry confirmed that none of the products formed contains chlorine atoms.
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Recent developments in Ion Chromatography.
Journal of chromatography. A, 2002Co-Authors: Corrado SarzaniniAbstract:This paper summarizes how Ion Chromatography is now a multimode technique suitable for solving analytical problems in all areas of interest. Current and more recent applicatIons will be overviewed within the new trends.
James S. Fritz - One of the best experts on this subject based on the ideXlab platform.
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Discovery and Early Development of Non-Suppressed Ion Chromatography
Journal of chromatographic science, 2010Co-Authors: James S. Fritz, Douglas T. GjerdeAbstract:This year marks the 30th anniversary of the publicatIon of Non-Suppressed Ion Chromatography, which is a method for the rapid separatIon of anIons with on-line conductimetric detectIon. In this method, the separatIon column is connected directly to the conductimetric detector. This single-column method is a simpler technique than the original suppressed Ion Chromatography method, which requires a large suppressor column to reduce the background conductance. In the new method, the background signal is reduced to a manageable level simply by using an Ion-exchange separatIon column of low exchange capacity that lowers the eluent concentratIon needed for separatIon. The eluent Ion used for separatIon is chosen based on having large, bulky structure, which lowers the equivalent conductance and facilitates detectIon of the sample anIons. This is a personal account of the initial discovery and early development of non-suppressed Ion Chromatography. The circumstances for the discovery are recounted by the two authors. Methods are described for determinatIon of anIons, catIons with indirect detectIon, and techniques for increasing detectIon sensitivity. A fundamental equatIon for the predictIon of Ion Chromatography detector response is given, and the development of several types of detectIon schemes for Ion Chromatography is discussed. Finally, the impact of non-suppressed Ion Chromatography is discussed together with comments on the discovery process.
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Factors affecting selectivity in Ion Chromatography.
Journal of chromatography. A, 2005Co-Authors: James S. FritzAbstract:Methods for separatIon of Ions by Ion-exchange, Ion-pair, and zwitterIon Ion Chromatography share at least one common thread--the induced formatIon of a catIon-anIon pair in the statIonary phase. Selectivity can be defined as the relative ability of sample Ions to form such a pair. Examples are given in anIon-exchange Chromatography to show the effect of variatIons in the geometry, bulkiness and polarity of the resin catIon on selectivity. The type of resin matrix, the hydrophobic nature of the resin surface and the degree of solvatIon also affect chromatographic behavior. The selectivity series observed in Ion Chromatography seems to be best explained by the interplay of two components: electrostatic attractIon (ES) and the enforced-pairing (EP) that is brought about by hydrophobic attractIon and by water-enforced Ion pairing. Selectivity in Ion-pair Chromatography (IPC) and in zwitterIon Ion Chromatography (ZIC) is affected by both the mobile phase catIon and anIon. This leads to elutIon orders for anIons that are different from conventIonal Ion-exchange Chromatography (IC) of anIons where catIons are excluded from the statIonary phase and have little effect on a separatIon. The elutIon order of anIons in ZIC is similar to that in IC except for small anIons of 2-charge, which are retained more weakly in ZIC. A unique advantage of ZIC is that sample Ions can be eluted as Ion pairs with pure water as the eluent and a conductivity detector. The mechanism for separatIon of anIons on a zwitterIonic statIonary phase has been a subject for considerable debate. The available facts point strongly to a partitIoning mechanism or a mixed mechanism in which partitIoning is dominant with a weaker Ion-exchange component.
Charles A. Lucy - One of the best experts on this subject based on the ideXlab platform.
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Recent advances in Ion Chromatography: A perspective
Journal of Chromatography A, 1996Co-Authors: Charles A. LucyAbstract:Abstract To properly ascertain what are the key advances in a field one must have a visIon of where the field is going in the future. Generally such a view is myopic and focuses largely on one's own field of study. To give a clearer view of where Ion Chromatography is now and where it is going in the future, Herb Laitinen's ‘Seven Ages of an Analytical Method’ was applied to Ion Chromatography. Currently, Ion Chromatography lies in the sixth age, wherein the method is a standard procedure. Recent advances that open new areas of applicatIon for Ion Chromatography are noted as these pull the technique back into the fifth age. However, Ion Chromatography also teeters on the brink of the seventh age of an analytical instrument, in which a technique of greater convenience, selectivity and sensitivity (i.e., capillary electrophoresis?) replaces it. Thus many of the current advances in Ion Chromatography are improvements relative to capillary electrophoresis. While often overlooked, probably the most notable improvements in Ion Chromatography in recent years have been in its convenience. Such improvements are essential for a technique in its sixth age. For if the procedure is to remain a standard method, analysts must be confident and comfortable in its use.
Li Yun-yan - One of the best experts on this subject based on the ideXlab platform.
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Research on some problems in Ion Chromatography analysis
Environmental Monitoring in China, 2005Co-Authors: Li Yun-yanAbstract:Based on master new development trends of Ion Chromatography, analysis and research on new evolutIon in Ion Chromatography, new technology of pre_treatment, common use methods of improve separatIon degree, some matter that to be pay attentIon, problems that usually meet. In order to prospect use Ion Chromatography to solve practice problems more and better.
